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babunello [35]
2 years ago
11

Question 6

Mathematics
1 answer:
Dmitriy789 [7]2 years ago
7 0

Answer:

The complete equation is: 75a+25b=25\cdot (3a+b).

Step-by-step explanation:

The expression is:

75a+25b=(a+b)

In this case we need to use numbers to make the expression on the right of the equal sign equivalent to the expression on the left.

The expression on the left of the equal sign is:

75a+25b

We will simplify the expression on the left of the equal sign to determine the expression on the right.

Simplify the expression 75a+25b as follows:

  • Factorize the coefficient of <em>a</em> and <em>b</em> as follows:

        75a+25b=(25\cdot3a)+(25\cdot b)

  • Take 25 common from both the coefficients:

        75a+25b=25\cdot (3a+b)

  • The expression on the right side of the equal sign is:

        25\cdot (3a+b)

So, the numbers to be inserted in the expression (a + b) are:

Multiply variable <em>a</em> by 3.

Multiply the resultant expression, i.e. (3a + b) by 25.

Thus, the complete equation is: 75a+25b=25\cdot (3a+b).

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alukav5142 [94]

Answer:

3

Step-by-step explanation:

-4-(-7)=

-4+(7)=

3

3 0
2 years ago
Find all the solutions for the equation:
Contact [7]

2y^2\,\mathrm dx-(x+y)^2\,\mathrm dy=0

Divide both sides by x^2\,\mathrm dx to get

2\left(\dfrac yx\right)^2-\left(1+\dfrac yx\right)^2\dfrac{\mathrm dy}{\mathrm dx}=0

\dfrac{\mathrm dy}{\mathrm dx}=\dfrac{2\left(\frac yx\right)^2}{\left(1+\frac yx\right)^2}

Substitute v(x)=\dfrac{y(x)}x, so that \dfrac{\mathrm dv(x)}{\mathrm dx}=\dfrac{x\frac{\mathrm dy(x)}{\mathrm dx}-y(x)}{x^2}. Then

x\dfrac{\mathrm dv}{\mathrm dx}+v=\dfrac{2v^2}{(1+v)^2}

x\dfrac{\mathrm dv}{\mathrm dx}=\dfrac{2v^2-v(1+v)^2}{(1+v)^2}

x\dfrac{\mathrm dv}{\mathrm dx}=-\dfrac{v(1+v^2)}{(1+v)^2}

The remaining ODE is separable. Separating the variables gives

\dfrac{(1+v)^2}{v(1+v^2)}\,\mathrm dv=-\dfrac{\mathrm dx}x

Integrate both sides. On the left, split up the integrand into partial fractions.

\dfrac{(1+v)^2}{v(1+v^2)}=\dfrac{v^2+2v+1}{v(v^2+1)}=\dfrac av+\dfrac{bv+c}{v^2+1}

\implies v^2+2v+1=a(v^2+1)+(bv+c)v

\implies v^2+2v+1=(a+b)v^2+cv+a

\implies a=1,b=0,c=2

Then

\displaystyle\int\frac{(1+v)^2}{v(1+v^2)}\,\mathrm dv=\int\left(\frac1v+\frac2{v^2+1}\right)\,\mathrm dv=\ln|v|+2\tan^{-1}v

On the right, we have

\displaystyle-\int\frac{\mathrm dx}x=-\ln|x|+C

Solving for v(x) explicitly is unlikely to succeed, so we leave the solution in implicit form,

\ln|v(x)|+2\tan^{-1}v(x)=-\ln|x|+C

and finally solve in terms of y(x) by replacing v(x)=\dfrac{y(x)}x:

\ln\left|\frac{y(x)}x\right|+2\tan^{-1}\dfrac{y(x)}x=-\ln|x|+C

\ln|y(x)|-\ln|x|+2\tan^{-1}\dfrac{y(x)}x=-\ln|x|+C

\boxed{\ln|y(x)|+2\tan^{-1}\dfrac{y(x)}x=C}

7 0
3 years ago
3 cm 7 cm 4 cm 8 cm area​
ryzh [129]

Answer:

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with area, multiply the side(s) by themselves for a single number, or their following numbers for more than 2 numbers.

Example

  • 18in x 18in = 324 square inches
  • 4in x 2in x 5in x 9in = 360 square inches

hope this helps!

4 0
1 year ago
A rock is dropped from the edge of a 550 foot cliff. It's position above the ground at any given time (t) is modeled by the func
Gemiola [76]
S(5) = -16*(5)*2 + 550 = 390

you just replace t with 5
3 0
2 years ago
Read 2 more answers
Put the steps of solving the equation in order from first to last.<br> 2x + 1 = -1
Alborosie

Answer:

x = 1

Step-by-step explanation:

2x + 1 = -1

2x = -1 - 1

2x = -2

x = -2 ÷ -2

x = 1

3 0
3 years ago
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